CVE-2026-43085
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with…
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8cPatch
- https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4Patch
- https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072Patch
- https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5bPatch
- https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34dPatch
- https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867Patch
- https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168cPatch
- https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978aPatch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.